Difference between revisions of "Melting Point"
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:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Melting points; purity analysis, pages 180-181, GCSE Chemistry; Third Edition, Oxford University Press, AQA ''] | :[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Melting points; purity analysis, pages 180-181, GCSE Chemistry; Third Edition, Oxford University Press, AQA ''] | ||
:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Melting points; transition elements, page 32, GCSE Chemistry; Third Edition, Oxford University Press, AQA ''] | :[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Melting points; transition elements, page 32, GCSE Chemistry; Third Edition, Oxford University Press, AQA ''] | ||
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| + | ====Edexcel==== | ||
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| + | :[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Melting point, pages 3, 5, GCSE Chemistry, Pearson, Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Melting point; ionic compounds, page 182, GCSE Combined Science, Pearson Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Melting point; ionic compounds, page 38, GCSE Chemistry, Pearson, Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Melting point; molecular compounds, page 186, GCSE Combined Science, Pearson Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Melting points, pages 147, 149, GCSE Combined Science, Pearson Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Melting points; molecular compounds, page 42, GCSE Chemistry, Pearson, Edexcel ''] | ||
Revision as of 17:10, 22 November 2019
Contents
Key Stage 4
Meaning
Melting point is the temperature at which a solid can become a liquid.
About Melting Points
- Different substances have different melting points.
- The melting point of a substance is determined by the strength of the bonds which hold the particles in fixed positions in a solid. The stronger the bonds the higher the melting point.
- When a substance is heated to its melting point it will remain at this constant temperature until all of the solid has melted.
- The melting point of pure water ice is 0°C or 273 Kelvin.
- Adding salt to ice can lower its melting point, causing it to melt at a lower temperature.
- Transition Metals generally have very high melting points, except for Mercury which is liquid at room temperature.
Detecting Purity
- The purity of a sample can be determined by observing its melting point. If the melting point is spread over a range of temperatures or different from the known values for the pure substance then the sample is not pure. For example to test if a sample of Water is pure it can be melted from Ice which should happen at exactly 0°C if it does not then it is not pure.
References
AQA
- Melting points, pages 36-37, 47, GCSE Chemistry; Third Edition, Oxford University Press, AQA
- Melting points, pages 80-81, 84, GCSE Physics; Third Edition, Oxford University Press, AQA
- Melting points; alkali metals, page 26, GCSE Chemistry; Third Edition, Oxford University Press, AQA
- Melting points; halogens, page 28, GCSE Chemistry; Third Edition, Oxford University Press, AQA
- Melting points; purity analysis, pages 180-181, GCSE Chemistry; Third Edition, Oxford University Press, AQA
- Melting points; transition elements, page 32, GCSE Chemistry; Third Edition, Oxford University Press, AQA
Edexcel
- Melting point, pages 3, 5, GCSE Chemistry, Pearson, Edexcel
- Melting point; ionic compounds, page 182, GCSE Combined Science, Pearson Edexcel
- Melting point; ionic compounds, page 38, GCSE Chemistry, Pearson, Edexcel
- Melting point; molecular compounds, page 186, GCSE Combined Science, Pearson Edexcel
- Melting points, pages 147, 149, GCSE Combined Science, Pearson Edexcel
- Melting points; molecular compounds, page 42, GCSE Chemistry, Pearson, Edexcel